The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/msgbuf.h

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    1 /*
    2  * Copyright (c) 1981, 1984, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)msgbuf.h    8.1 (Berkeley) 6/2/93
   34  * $FreeBSD: releng/5.0/sys/sys/msgbuf.h 106917 2002-11-14 16:11:12Z tmm $
   35  */
   36 
   37 #ifndef _SYS_MSGBUF_H_
   38 #define _SYS_MSGBUF_H_
   39 
   40 struct msgbuf {
   41 #define MSG_MAGIC       0x063062
   42         u_int   msg_magic;
   43         int     msg_size;               /* size of buffer area */
   44         int     msg_bufx;               /* write pointer */
   45         int     msg_bufr;               /* read pointer */
   46         char    *msg_ptr;               /* pointer to buffer */
   47 };
   48 
   49 #ifdef _KERNEL
   50 extern int      msgbuftrigger;
   51 extern struct   msgbuf *msgbufp;
   52 void    msgbufinit(void *ptr, int size);
   53 
   54 #if !defined(MSGBUF_SIZE)
   55 #define MSGBUF_SIZE     32768
   56 #endif
   57 
   58 #endif
   59 
   60 #endif

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